Desktop Dyno 2000 doesn't have the 4.0L but I just chose a Crystler I6 and entered in the 4.0 bore size, crank stroke, comp ratio, cam stats, head stats, etc.... It came out at the HP/TQ ratings my FSM says. I will post links to the files if anyone is intersted. I have one for the HO, RenixII, and a 4.6L AP stroker.